Metered, not modelled
Scottish Borders vs Derby
Scottish Borders and Derby roofs made much the same last year.
757 against 756 kWh per kWp at the median, from 163 and 245 real systems.
Where the two actually overlap
Both areas, grouped by what each system made. The medians differ, but the shapes sit largely on top of one another — a good Derby roof beats a poor Scottish Borders one comfortably. Location moves the odds; it does not decide the outcome.
Scottish Borders: the middle half of 163 systems made 709–831 kWh per kWp. Derby: the middle half of 245 systems made 695–797 kWh per kWp.
Both figures are what real systems metered last year, so the gap mixes sunlight with system age, roof direction and shading. It is the difference in what people actually got, not a difference in sunshine alone.
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Output figures from openclimatefix/uk_pv (Hugging Face, CC-BY-4.0), collected by Sheffield Solar. How we measure.
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